Barbarian
Member
Behe has since admitted that irreducible complexity can evolve. It's been observed to evolve.Can you provide the quote? "to some degree" is vague. The subtitle of Behe's first book makes clear what he set out to do, provide a biochemical challenge to evolution. In his book he quoted Darwin:
"If it could be demonstrated that any complex organ existed which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down." -Charles Darwin, Origin of Species
Behe has shown exactly what Darwin claimed would destroy the theory of evolution, through the concept of "irreducible complexity."
The principle is that an irreducibly complex system consists of a number of components, and the loss of any one of them would make the system inoperable.
In 1982, Barry Hall of the University of Rochester began a series of experiments in which he deleted the bacterial gene for the enzyme beta-galactosidase. The loss of this gene makes it impossible for the bacteria to metabolize the sugar lactose.What happened next? Under appropriate selection conditions Hall found that the bacteria evolved not only the gene for a new beta-galactosidase enzyme (called the evolved beta-galactosidase gene, or ebg), but also a control sequence that switched the new gene on when glucose was present. Finally, a new chemical reaction evolved as well,producing allolactose, the chemical signal that normally switcheson the lac permease gene, allowing lactose to flow into the cell.
In my book I quoted evolutionary biologist Douglas Futuyma's description of these experiments:
"Thus an entire system of lactose utilization had evolved, consisting of changes in enzyme structure enabling hydrolysis of the substrate; alteration of a regulatory gene so that the enzyme can be synthesized in response to the substrate; and the evolution of an enzyme reaction that induces the permease needed for the entry of the substrate. One could not wish for a batter demonstration of the neoDarwinian principle that mutation and natural selection in concert are the source of complex adaptations." [ DJ Futuyma , Evolution, ©1986, Sinauer Associates, Sunderland, MA. pp. 477-478.]
The system now consists of lactose, the evolved gene, and the evolved regulator. If one of these is not present, the system doesn't work. By Behe's definition, it's irreducibly complex. And yet it was observed to evolve.
It gets worse for Behe. He touted the bacterial flagellum and the vertebrate clotting system as irreducibly complex. With the data he had at the time, it seemed so. But as we learned more about it, turns out the flagellum has an evolutionary precursor.
Philos Trans R Soc Lond B Biol Sci
2015 Oct 5;370(1679):20150020.
Type III secretion systems: the bacterial flagellum and the injectisome
Abstract
The flagellum and the injectisome are two of the most complex and fascinating bacterial nanomachines. At their core, they share a type III secretion system (T3SS), a transmembrane export complex that forms the extracellular appendages, the flagellar filament and the injectisome needle. Recent advances, combining structural biology, cryo-electron tomography, molecular genetics, in vivo imaging, bioinformatics and biophysics, have greatly increased our understanding of the T3SS, especially the structure of its transmembrane and cytosolic components, the transcriptional, post-transcriptional and functional regulation and the remarkable adaptivity of the system. This review aims to integrate these new findings into our current knowledge of the evolution, function, regulation and dynamics of the T3SS, and to highlight commonalities and differences between the two systems, as well as their potential applications.Yep. A simpler version exists, and it does a different function. But slightly modified, it can also provide movement.
Here's a rundown on the history of "I don't see how that could have evolved, so it's impossible."
The eye has been proposed to be irreducibly complex, but in nature we see every step from a simple dark patch on the surface of an organism to the highly complex vertebrate and mollusk eyes. In the mollusks, all these steps still exist.
Nope. His favorite examples all crashed and burned when tested.Behe has shown exactly what Darwin claimed would destroy the theory of evolution, through the concept of "irreducible complexity."
A religion, it was found to be by the Dover court. At best a philosophy, which overtly claims to be for the purpose of establishing God.Once people actually learn what intelligent design theory is
"Governing Goals
- To defeat scientific materialism and its destructive moral, cultural and political legacies.
- To replace materialistic explanations with the theistic understanding that nature and human beings are created by God."
And here's another example. If you had done a little research you'd perhaps notice that some IDers (e.g. Michael Denton) have distanced themselves from the religion part of ID and have suggested a "designer" who "might be a space alien" (Philip Johnson, Darwin on Trial) who "front-loaded" the universe to produce living things by natural means. Denton goes out of his way to show that a reasonable philosophy of ID is inconsistent with special creationism and says so (Nature's Destiny)As you're fond of saying, people are often down on things they aren't up on.
Which seems pretty likely to me, given scripture and what I've seen of living systems. Except the space alien, of course. But it's still a religious doctrine, albeit an accurate one IMO.